All these structures can show up in the two-loop divergences, but
only two of these terms, namely, \(\Sigma _5\)  and \(\Sigma _6\)  are critically
important because they do not vanish on shell. The two-loop
calculation were done in [1]} and confirmed in [2]}
by using another calculational approach. The results confirmed the
non-zero coefficient of \( \Sigma _5\) . The conclusion is that there are no
miracles and the theory of QG based on GR is non-renormalizable.
